Minor PSR2 fixes

src/Bus/Middleware/MessageBusSupportingMiddleware.php

@@ -61,12 +61,13 @@ public function handle($message)
     private function callableForNextMiddleware($index)
     {
         if (!isset($this->middlewares[$index])) {
-            return function() {};
+            return function () {
+            };
         }
 
         $middleware = $this->middlewares[$index];
 
-        return function($message) use ($middleware, $index) {
+        return function ($message) use ($middleware, $index) {
             $middleware->handle($message, $this->callableForNextMiddleware($index + 1));
         };
     }

src/CallableResolver/Exception/CouldNotResolveCallable.php

@@ -22,7 +22,7 @@ private static function printValue($value)
     private static function convertValue($value)
     {
         if (is_array($value)) {
-            return array_map(function($value){
+            return array_map(function ($value) {
                 return self::convertObject($value);
             }, $value);
         }

src/Subscriber/NotifiesMessageSubscribersMiddleware.php

@@ -25,8 +25,11 @@ class NotifiesMessageSubscribersMiddleware implements MessageBusMiddleware
      */
     private $level;
 
-    public function __construct(MessageSubscribersResolver $messageSubscribersResolver, LoggerInterface $logger = null, $level = LogLevel::DEBUG)
-    {
+    public function __construct(
+        MessageSubscribersResolver $messageSubscribersResolver,
+        LoggerInterface $logger = null,
+        $level = LogLevel::DEBUG
+    ) {
         $this->messageSubscribersResolver = $messageSubscribersResolver;
 
         if (null === $logger) {